Linux (Ubuntu) Installation - Supporting Software - 12.10¶

This document describes the needed installation and configuration of supporting software for iHRIS on Ubuntu 12.10, Quantal Quetzal. {{otherversions|Linux (Ubuntu) Installation - Supporting Software}}

Getting Ready¶

Here are instructions for installing the supporting software for iHRIS on a Linux (Ubuntu) system. If you need help installing Ubuntu you may want to take a look at these directions for installing a Server or a Desktop system. For a server setup, we recommend using a LTS (long term support) version of Ubuntu.

Note: Unless specifically mentioned, all the commands below are run using a terminal. You can start this in Ubuntu by going to Applications -> Accessories -> Terminal. Any time a command begins with sudo it will prompt for your password because this will be run with administrative privileges. When you run sudo multiple times, only the first time will ask for your password.

Note: Some installation commands will prompt for inputs in the terminal window, usually with a blue background. The mouse doesn’t work to click on options here. You can use Tab to move between options and the space bar to check or uncheck selections.

Note: Some commands will launch the gedit file editor. Look at the documentation if you need additional help.

We begin by install a Lamp server (You can find more help here ):

sudo apt-get install tasksel
sudo tasksel install lamp-server

If you have never used mysql on your system, you will be asked to set the ‘root’ password for mysql. We will refer to this password as XXXXX below.

Important : Make sure your email system is correctly configured. Under a default Ubuntu installation, you can do this with one of two commands:

sudo apt-get install postfix
sudo dpkg-reconfigure postfix

Follow the on-screen instructions to set up email on your system. For additional help with installing Postfix, look at these instructions . On Debian systems, the same commands can be used, but <tt>exim4</tt> is the default MTA instead of <tt>postfix</tt>

If you are using another Linux distribution, make sure your system can send email properly before continuing.

Configuring MYSQL¶

Make sure you have in /etc/mysql/my.cnf the following values set:

sudo gedit /etc/mysql/my.cnf

query_cache_limit       = 4M
query_cache_size        = 64M

It appears that they were reduced with Karmic.

To configure MySQL so iHRIS can create needed functions:

mysql -u root -p

Enter the password you set above (XXXXX) for MySQL. You will now be able to send commands to MySQL and the prompt should always begin with ‘mysql> ‘. Type these commands:

SET GLOBAL log_bin_trust_function_creators = 1;
exit

Configuring PHP¶

Next, you’ll need to increase the memory limit for PHP. You can do this by editing the /etc/php5/apache2/php.ini.

sudo gedit /etc/php5/apache2/php.ini

Change the following line:

memory_limit = 32M

to:

memory_limit = 128M

Installing Pear and PECL Packages¶

We need to install a few Pear and PECL packages for PHP. For the Pear packages you can do:

sudo apt-get install php-pear  php-mdb2 php-mdb2-driver-mysql  php5-gd php5-tidy php5-intl
sudo pear install text_password console_getopt

APC¶

We need to install the APC module for PHP.

sudo apt-get install php-apc

During certain activities like installation and upgrades you may need more memory than APC uses by default. We also want to turn of the slam defense. We need to edit the configuration file file for apc:

sudo gedit /etc/php5/mods-available/apc.ini

It should look like this:

extension=apc.so
apc.write_lock=1
apc.shm_size=100M
apc.slam_defense=0

See slam defense and this .

You’ll need to restart Apache after making this change.

sudo /etc/init.d/apache2 restart

Debian Squeeze¶

If you are using Debian Squeeze, then the value of apc.shm_size should be:

apc.shm_size=100

Configuring Apache Web Server¶

You will see later we are using the apache rewrite module. To enable the module:

sudo a2enmod rewrite

Now we need to make sure we can use the .htaccess file. <source lang=”bash”> sudo gedit /etc/apache2/sites-available/default </source> Change: <source lang=”apache”> <Directory /var/www/>

Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all

</Directory> </source> to: <source lang=”apache”> <Directory /var/www/>

Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all

</Directory> </source> Save and quit.

Let us restart the Apache webserver using: <source lang=”bash”> sudo /etc/init.d/apache2 restart </source>

Install Memcached¶

With version 4.0.4 and greater of iHRIS you can use memcached to improve performance

Note: Memcached is used to cache data from the database. Thus if you are an a sitaution where you would need to restart the webserver by

sudo /etc/init.d/apache2 restart

you should now do: sudo /etc/init.d/apache2 restart && sudo /etc/init.d/memcached restart

To install, simply do <source lang=’bash’>

sudo apt-get install php5-memcached memcached

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